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Curve25519 library for Java

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/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 * 
 * Licensed according to the LICENSE file in this repository.
 */

package org.whispersystems.curve25519;

import org.whispersystems.curve25519.java.Sha512;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class JCESha512Provider implements Sha512 {
    public static final int SHA512_SIZE = 64;

    @Override
    public void calculateDigest(byte[] out, byte[] in, long length) {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
            messageDigest.update(in, 0, (int) length);
            byte[] digest = messageDigest.digest();
            System.arraycopy(digest, 0, out, 0, SHA512_SIZE);
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError(e);
        }
    }

    @Override
    public void updateDigest(MessageDigest md, byte[] in, long length) {
        md.update(in, 0, (int) length);
    }

    @Override
    public void finishDigest(byte[] out, MessageDigest md) {
        byte[] digest = md.digest();
        System.arraycopy(digest, 0, out, 0, SHA512_SIZE);
    }

    @Override
    public MessageDigest initDigest() {
        try {
            return MessageDigest.getInstance("SHA-512");
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError(e);
        }
    }
}